PPS/PPS (Progressive Power Steering) — System Outline, page 2

SYSTEM OUTLINE

THE PPS (HYDRAULIC REACTION TYPE) CONTROLS THE HYDRAULIC PRESSURE APPLIED TO THE HYDRAULIC REACTION CHAMBER IN THE GEAR BOX CONTROL UNIT USING THE PPS ECU, TO CHANGE THE STEERING FORCE AND PROVIDE OPTIMUM STEERING FEELING AT ANY VEHICLE SPEEDS AND UNDER ANY STEERING CONDITIONS.
(PPS OPERATION)
WHEN THE IGNITION SW IS TURNED ON THE STARTING CURRENT FLOWS FROM THE ECU–IG FUSE TO TERMINAL 4 OF THE PPS ECU. THE PPS ECU MONITORS VEHICLE SPEED, INPUT SIGNAL TO TERMINAL 5 OF THE ECU. WHEN THE VEHICLE SPEED IS LOW, THE PPS ECU SENDS A HIGHER–CURRENT FROM TERMINAL 1 OF THE ECU → TERMINAL 1 OF THE SOLENOID VALVE → TERMINAL 2 → TERMINAL 2 OF THE ECU → TERMINAL 6 → GROUND, INCREASING THE SOLENOID VALVE OPENING ANGLE TO PROVIDE COMFORTABLE STEERING OPERATION. WHEN THE VEHICLE SPEED IS HIGH, THE PPS ECU DECREASES THE SOLENOID VALVE OPENING ANGLE BY REDUCING THE CURRENT TO THE VALVE TO PROVIDE RESPONSIVE STEERING FEELING.

SERVICE HINTS

P 1 PPS SOLENOID
1–2 : APPROX. 7.7Ω (25˚C, 77˚F)
P 4 PPS ECU
4–GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
6–GROUND : ALWAYS CONTINUOUS

: PARTS LOCATION

CODE SEE PAGE CODE SEE PAGE CODE SEE PAGE
C10 A 28 P 1 27 (2JZ–GE) V10 25 (2JZ–GTE)
C12 B 28 P 4 29 27 (2JZ–GE)
P 1 25 (2JZ–GTE) T 6 29

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE SEE PAGE JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1E 20 INSTRUMENT PANEL WIRE AND J/B NO. 1 (LEFT KICK PANEL)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE SEE PAGE JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
Ii1 38 ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)

: GROUND POINTS

CODE SEE PAGE GROUND POINTS LOCATION
IF 36 LEFT KICK PANEL
IH 36 RIGHT KICK PANEL

: SPLICE POINTS

CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS
I 8 38 INSTRUMENT PANEL WIRE I 8 38 INSTRUMENT PANEL WIRE

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